The network update time depends on the network Phone Number List topology and load. Updating the Bitcoin network takes a few minutes. Once the network load becomes more or less, other cryptocurrencies, such as Quark, reduce Phone Number List block closing times to less than a minute and experience constant fork exposure. One might Phone Number List object to Ethereum's excellent Ghost protocol, which is not exposed to forks.
Although its orphan blocks ("uncles") are not part of the Phone Number List resulting blockchain, they do participate in voting on the chain version, so the block interval can be reduced to about 20 seconds. But the protocol has its own loopholes. For Phone Number List example, Ghost networks are prone to network storms, when Ethernet networks experience extreme Phone Number List traffic under a certain load.
In short, the network is vulnerable because its Phone Number List update time is proportional to its traffic. Under critical load (too many transactions per second), the update time becomes comparable to the block generation time. In this case, different miners can Phone Number List independently generate candidate blocks to be included in the Phone Number List blockchain. Surprisingly: these blocks will contain the same transactions.